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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,656,348 | $ 2,200,374 | $ 5,073,924 | $ 4,378,544
Operating income (loss) | 123,039 | 109,791 | 198,260 | 184,865
Depreciation | 50,034 | 44,650 | 98,753 | 87,343
Electric Power Infrastructure Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,570,173 | 1,300,729 | 3,138,680 | 2,520,231
Operating income (loss) | 146,011 | 113,043 | 286,906 | 212,715
Depreciation | 23,258 | 22,150 | 47,528 | 44,236
Oil and Gas Infrastructure Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,086,175 | 899,645 | 1,935,244 | 1,858,313
Operating income (loss) | 43,829 | 67,751 | 53,886 | 106,568
Depreciation | 22,480 | 18,134 | 43,175 | 35,498
Corporate and non-allocated costs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (66,801) | (71,003) | (142,532) | (134,418)
Depreciation | $ 4,296 | $ 4,366 | $ 8,050 | $ 7,609

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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